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Latex Agglutination Test (latex + agglutination_test)

Distribution by Scientific Domains

Medical Sciences	60%

Selected Abstracts

Cutaneous cryptococcosis associated with lepromatous leprosy

INTERNATIONAL JOURNAL OF DERMATOLOGY, Issue 6 2001
Rubem David Azulay MD
A 65-year-old Brazilian man presented with an erythematous nodular lesion on the left forearm (Fig. 1). The patient had been treated with multidrug therapy for 8 months for lepromatous leprosy. During therapy, he developed recurrent episodes of reactions which were treated with high doses of prednisone and thalidomide. The histopathology of the cutaneous nodular lesion showed a granulomatous inflammatory infiltrate; some histiocytes contained vacuolations and others demonstrated oval-like or coma-like structures (Fig. 2). The specimen was cultivated in Sabouraud agar at room temperature. The colonies were transferred to Petri dishes containing Niger Seed Agar (NSA) (Fig. 3). The confirmed diagnosis was Cryptococcus neoformans var. neoformans based on microscopy and physiology, including the canavanine,glycine,bromothymol blue (CGB) medium (Lazéra MS, Pires FDA, Camillo-Coura L et al. Natural habitat of Cryptococcus neoformans var. neoformans in decaying wood forming hollows in living trees. J Med Vet Mycol 1996; 34: 127,131). The liquor culture was negative. Hemoculture and urine culture were also negative. Latex agglutination test was blood positive and liquor negative. Figure 1. Erythematous nodular lesion on the left forearm measuring 9 cm in diameter Figure 2. Granulomatous infiltrate presenting oval-like or coma-like structures inside the histiocytes (mucicarmine stain, ×,100) Figure 3. Petri dishes with Niger Seed Agar containing numerous colonies of Cryptococcus neoformans var. neoformans The patient's hemogram revealed normocytic anemia and normal total and differential white blood count. The CD4 count was 189/m3 and the CD8 count was 141/m3. Serology for anti-human immunodeficiency virus-I (anti-HIV-I) antibodies was negative. The X-ray of the lungs showed an areolar image in the superior lobe of the right lung. Therapy with prednisone was suspended and fluconazole (300 mg/day) was prescribed. The nodular cutaneous lesion regressed completely after 90 days. The patient was submitted to a second skin biopsy for treatment control. The culture of the specimen taken was still positive and the histopathology showed the same picture as before treatment. After 5 months of continued therapy with fluconazole, another biopsy was performed but no fungus was recovered from the specimen. [source]

Evaluation of a reversed passive latex agglutination test for the detection of Verocytotoxin (VT) expressed by strains of VT-producing Escherichia coli

LETTERS IN APPLIED MICROBIOLOGY, Issue 6 2001
H. Chart
Aims: To compare an experimental Reversed-Passive Latex Agglutination (RPLA) with Vero cells for the detection of Verocytotoxin expressed by VT-producing strains of Escherichia coli (VTEC). Methods and Results: The RPLA was used alongside a Vero cell tissue culture assay for the detection of VT in bacterial culture supernatant fluids and patients' faecal extracts. Conclusions: The RPLA was comparable with the Vero cell assay, although slightly less sensitive. Significance and Impact of the Study: The RPLA test proved to be a simple, rapid and convenient method of detecting VT in bacterial culture supernatant fluids and in the faeces of patients infected with VTEC. [source]

Performance of commercial latex agglutination tests for the differentiation of Candida dubliniensis and Candida albicans in routine diagnostics,

APMIS, Issue 11 2007
E. CHRYSSANTHOU
Candida dubliniensis is phenotypically similar to Candida albicans and may therefore be underdiagnosed in the clinical microbiology laboratory. The performance of Bichro-Dubli latex agglutination test for rapid species identification of C. dubliniensis was prospectively evaluated on 111 vaginal and 118 respiratory isolates. These had presumptively been identified as C. albicans/C. dubliniensis by their green colonies on CHROMagar Candida plates. Bichro-Dubli test identifed 2 (1.8%) vaginal and 6 (5.1%) respiratory isolates as C. dubliniensis. The test was also positive for 37 C. dubliniensis control strains characterised by 18S-28S DNA-sequencing. Bichro-Dubli test is thus a sensitive and accurate tool for rapid diagnostics in routine laboratories. [source]

A rapid latex agglutination test for gender identification in the Atlantic bluefin tuna, Thunnus thynnus (Linnaeus)

AQUACULTURE RESEARCH, Issue 9 2010
Elisabetta Micera
Abstract A rapid, one-step agglutination assay has been developed, based on latex particles sensitized with antibodies against vitellogenin (Vtg), aimed at Atlantic bluefin tuna, Thunnus thynnus (Linnaeus) (ABFT), gender identification. The egg-yolk precursor protein Vtg was used as a gender marker for the assay as it is a female-specific protein synthesized during reproductive maturation. The presence of Vtg in the plasma was revealed in 60,120 s through an agglutination reaction by mixing small volumes of ABFT plasma and an anti-Vtg antibody-latex suspension on a microscope slide. The effectiveness of the present test was restricted to the months of May and June, concomitant with high circulating Vtg levels. Because of its rapidity and ease of performance in the field, the present gender identification assay could be useful for broodstock management in the aquaculture industry as well as in tagging studies on wild populations. [source]